Affiliate marketing is one of the most effective and powerful ways of earning some money online. Committing some of the most common mistakes will cost the marketers a large portion taken from the profit they are making everyday. Mistake number 1: Choosing the wrong affiliate program. Promoting a product you are more passionate about is easier and it will pay you rich dividends. Mistake number 2: Joining too many affiliate programs. The best way to get excellent result is by joining just one program, so that you can fully focus on your promotion efforts. Mistake number 3: Not buying the product or using the service. Try the product personally first before you sign up as an affiliate to see if it is really delivering what it promises as this approach will help you convince prospects about the benefits of the product.